supports-preserve-symlinks-flag 1.0.0

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:npm/supports-preserve-symlinks-flag@1.0.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/supports-preserve-symlinks-flag@1.0.0
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:4947cc0ecc0d9268607a16c64cfc7e53cfe2e09b1da2e27f6268d2224b3338ce","constraints":{"executionContext":"node"},"contract":["supportsPreserveSymlinksFlag is a boolean value indicating if --preserve-symlinks flag is supported","supportsPreserveSymlinksFlag returns true in Node.js environments supporting the flag (\u003e= 6.2.0)","wrapper function isPreserveSymlinksSupported correctly reports flag support"],"goal":"verify pkg:npm/supports-preserve-symlinks-flag@1.0.0","kind":"HOW","packages":["pkg:npm/supports-preserve-symlinks-flag@1.0.0"],"schemaVersion":1},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/supports-preserve-symlinks-flag@1.0.0"],"schemaVersion":1,"subject":"pkg:npm/supports-preserve-symlinks-flag@1.0.0","verifierAdapter":"node-typescript@1"}

{
  "name": "sample-supports-preserve-symlinks-flag",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-supports-preserve-symlinks-flag",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "supports-preserve-symlinks-flag": "1.0.0"
      }
    },
    "node_modules/supports-preserve-symlinks-flag": {
      "version": "1.0.0",
      "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
      "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.4"
      }
    }
  }
}

{
  "name": "sample-supports-preserve-symlinks-flag",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification sample for supports-preserve-symlinks-flag",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "supports-preserve-symlinks-flag": "1.0.0"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/supports-preserve-symlinks-flag@1.0.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/supports-preserve-symlinks-flag@1.0.0"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "runtime": "node@22.23.2"
  }
}

const supportsPreserveSymlinksFlag = require('supports-preserve-symlinks-flag');

function isPreserveSymlinksSupported() {
  return supportsPreserveSymlinksFlag;
}

module.exports = {
  supportsPreserveSymlinksFlag,
  isPreserveSymlinksSupported
};

const assert = require('node:assert');
const supportsPreserveSymlinksFlag = require('supports-preserve-symlinks-flag');
const { isPreserveSymlinksSupported } = require('../src/index.js');

// 1. Value must be a boolean primitive
assert.strictEqual(typeof supportsPreserveSymlinksFlag, 'boolean', 'supportsPreserveSymlinksFlag must be a boolean');

// 2. In Node.js 22.x (and any Node.js >= 6.2.0), the flag is supported so it must be true
assert.strictEqual(supportsPreserveSymlinksFlag, true, 'supportsPreserveSymlinksFlag must be true in Node.js >= 6.2.0');

// 3. Wrapper function in src/index.js returns the expected boolean value
assert.strictEqual(typeof isPreserveSymlinksSupported(), 'boolean', 'isPreserveSymlinksSupported must return a boolean');
assert.strictEqual(isPreserveSymlinksSupported(), true, 'isPreserveSymlinksSupported must return true');

// 4. Verify consistency with process.allowedNodeEnvironmentFlags when present
if (process.allowedNodeEnvironmentFlags) {
  const hasFlag = process.allowedNodeEnvironmentFlags.has('--preserve-symlinks');
  assert.strictEqual(supportsPreserveSymlinksFlag, hasFlag, 'supportsPreserveSymlinksFlag should match process.allowedNodeEnvironmentFlags');
}

console.log('Contract tests passed successfully.');